How will you fix phpbb:critical error?

If you get phpBB: Critical Error, then in that case there is a chance the database is broken.

You have to run following sql queries  either on mysql prompt or phpmyadmin :

UPDATE phpbb_config SET config_value = ‘ID_NUMBER_HERE’ WHERE config_name = ‘default_style’;

UPDATE phpbb_config SET config_value = ‘1’ WHERE config_name = ‘override_user_style’;

If not , then  you can refer  :

https://www.phpbb.com/kb/article.php?article_id=13

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